Patents by Inventor Walter A. Edwards

Walter A. Edwards has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Property variation of dispersion resins by electrofiltration
    Patent number: 4693800
    Abstract: The surface characteristics of dispersed particles such as vinyl resins are changed through the use of an anode electrolyte in an electrofilter. Accordingly, the properties of intermediate and final products made from these resins such as plastisols and fused films or coatings can be favorably changed. Properties which are altered include plastisol viscosity, film clarity, and foamability.
    Type: Grant
    Filed: November 29, 1985
    Date of Patent: September 15, 1987
    Assignee: The B. F. Goodrich Company
    Inventors: Walter A. Edwards, George R. Huddleston, Jr.
  • Low energy dewatering of dispersed particle latexes by electrofiltration
    Patent number: 4671860
    Abstract: A process for the removal of water from dispersed particles such as vinyl resins uses electrofiltration to yield a high total solids content wetcake. A final dryer such as a fluid energy dryer is used to yield a dry, finely divided resin or polymer. Accordingly, the need for various spray drying methods accompanied by subsequent harsh grinding steps are eliminated. Substantial energy cost savings are realized and the need for coagulation additives are eliminated as well as the necessary removal and neutralization of undesirable residues.
    Type: Grant
    Filed: November 29, 1985
    Date of Patent: June 9, 1987
    Assignee: The B. F. Goodrich Company
    Inventors: George R. Huddleston, Jr., Walter A. Edwards